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Retirement Benefit Plans (Defined Contribution Plans) (Details)
$ in Millions
2 Months Ended 3 Months Ended 9 Months Ended
May 29, 2020
store
Jul. 31, 2020
USD ($)
Oct. 31, 2020
USD ($)
Nov. 02, 2019
USD ($)
Oct. 31, 2020
USD ($)
Nov. 02, 2019
USD ($)
Apr. 30, 2020
employee
Feb. 01, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Curtailment loss recognized     $ 0.0 $ 0.0 $ 5.0 $ 0.0    
Discount rate   2.64% 3.00%   3.00%     3.08%
VERP                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Number of associates | employee             4,300  
Number of associates accepted | store 2,600              
Primary Pension Plan | VERP                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Curtailment loss recognized   $ 4.0            
Benefit obligation period increase (decrease)   117.0            
Benefit plan assets period increase (decrease)   74.0            
Defined benefit plan, funded percentage     100.00%   100.00%      
Supplemental Pension Plan | VERP                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Curtailment loss recognized   1.0            
Benefit obligation period increase (decrease)   $ (0.4)            
Other Benefit Plans                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Benefit obligation period increase (decrease)     $ 166.0